body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(135deg, #e0e7ff 0%, #f4f6fb 100%);
  margin: 0;
  padding: 0;
  min-height: 100vh;
}
.container {
  max-width: 400px;
  margin: 60px auto;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 8px 32px rgba(80, 112, 255, 0.12), 0 1.5px 6px rgba(0,0,0,0.04);
  padding: 40px 28px 28px 28px;
  transition: box-shadow 0.3s;
}
.container:hover {
  box-shadow: 0 12px 40px rgba(80, 112, 255, 0.18), 0 2px 8px rgba(0,0,0,0.06);
}
h1 {
  text-align: center;
  color: #4f8cff;
  margin-bottom: 28px;
  letter-spacing: 2px;
  font-weight: 700;
  font-size: 2rem;
}
label {
  display: block;
  margin-bottom: 8px;
  color: #444;
  font-weight: 500;
}
input[type="number"] {
  width: 70px;
  padding: 6px 10px;
  margin-bottom: 18px;
  border: 1.5px solid #bfcfff;
  border-radius: 6px;
  font-size: 16px;
  outline: none;
  transition: border 0.2s;
}
input[type="number"]:focus {
  border: 1.5px solid #4f8cff;
  background: #f0f6ff;
}
.options {
  margin-bottom: 18px;
}
.options label {
  display: inline-block;
  margin-right: 14px;
  font-size: 15px;
  color: #3a3a3a;
  cursor: pointer;
  transition: color 0.2s;
}
.options input[type="checkbox"] {
  accent-color: #4f8cff;
  margin-right: 4px;
  transform: scale(1.1);
}
button {
  background: linear-gradient(90deg, #4f8cff 60%, #2563eb 100%);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 20px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 10px;
  box-shadow: 0 2px 8px rgba(80, 112, 255, 0.08);
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}
button:hover {
  background: linear-gradient(90deg, #2563eb 60%, #4f8cff 100%);
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 4px 16px rgba(80, 112, 255, 0.16);
}
.result {
  display: flex;
  align-items: center;
  margin-top: 22px;
  gap: 8px;
}
#result {
  flex: 1;
  padding: 10px;
  font-size: 17px;
  border: 1.5px solid #bfcfff;
  border-radius: 6px;
  background: #f7faff;
  color: #2a2a2a;
  transition: border 0.2s, background 0.2s;
}
#result:focus {
  border: 1.5px solid #4f8cff;
  background: #eaf2ff;
}
@media (max-width: 500px) {
  .container {
    padding: 18px 6vw 18px 6vw;
    margin: 24px 0;
  }
  h1 {
    font-size: 1.3rem;
  }
  button {
    font-size: 15px;
    padding: 8px 10px;
  }
  #result {
    font-size: 15px;
    padding: 8px;
  }
}